package com.sky.aspect;

import com.sky.annotation.AutoFill;
import com.sky.constant.AutoFillConstant;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.time.LocalDateTime;

//自定义切面
@Aspect
@Component
@Slf4j
public class AutoFillAspect {
    //切点
    @Pointcut("execution(* com.sky.mapper.*.*(..))&&@annotation(com.sky.annotation.AutoFill)")
    public void autoFillPointCut(){}

    @Before("autoFillPointCut()")
    public void autoFill(JoinPoint joinPoint) throws InvocationTargetException, IllegalAccessException, NoSuchMethodException {
        log.info("公共字段开始自动填充");
        //获取被拦截方法的数据库操作类型
        MethodSignature signature =(MethodSignature) joinPoint.getSignature();//方法签名对象
        AutoFill autoFill=signature.getMethod().getAnnotation(AutoFill.class);//获取方法上的注解
        OperationType operationType=autoFill.value();//获取数据库操作类型
        //获取被拦截方法参数--实体对象
        Object[] args=joinPoint.getArgs();
        if(args==null||args.length==0){
            return;
        }
        Object entity=args[0];
        //准备赋值数据
        LocalDateTime now= LocalDateTime.now();
        Long currentId= BaseContext.getCurrentId();
        //根据数据库操作类型进行赋值
        if(operationType==OperationType.INSERT){
            //为四个字段进行赋值
            Method setCreateTime=entity.getClass().getMethod(AutoFillConstant.SET_CREATE_TIME,LocalDateTime.class);
            Method setUpdateTime=entity.getClass().getMethod(AutoFillConstant.SET_UPDATE_TIME,LocalDateTime.class);
            Method setCreateUser=entity.getClass().getMethod(AutoFillConstant.SET_CREATE_USER,Long.class);
            Method setUpdateUser=entity.getClass().getMethod(AutoFillConstant.SET_UPDATE_USER,Long.class);
            //通过反射为对象属性赋值
            setCreateTime.invoke(entity,now);
            setUpdateTime.invoke(entity,now);
            setCreateUser.invoke(entity,currentId);
            setUpdateUser.invoke(entity,currentId);
        } else if (operationType==OperationType.UPDATE){
            //为两个字段进行赋值
            Method setUpdateTime=entity.getClass().getMethod(AutoFillConstant.SET_UPDATE_TIME,LocalDateTime.class);
            Method setUpdateUser=entity.getClass().getMethod(AutoFillConstant.SET_UPDATE_USER,Long.class);
            setUpdateTime.invoke(entity,now);
            setUpdateUser.invoke(entity,currentId);
        }
    }
}
